Mesoporous β-MnO2 air electrode modified with pd for rechargeability in lithium-air battery

Arjun Kumar Thapa, Yuiko Hidaka, Hidehisa Hagiwara, Shintaro Ida, Tatsumi Ishihara

Research output: Contribution to journalArticlepeer-review

89 Citations (Scopus)

Abstract

The electrochemical performance and electrode reactions using ordered mesoporous β-MnO2 modified with Pd as a cathode catalyst for rechargeable Li-air batteries was reported. Well-ordered mesoporous β-MnO2 was prepared using mesoporous silica KIT-6 as a template under hydrothermal synthesis of Mn(NO3)2H2O. The obtained mesoporous β-MnO2 shows narrow pore size distribution of 1 nm. With the dispersion of small amounts of Pd to β-MnO2, mesoporous β-MnO2 exhibited a high initial discharge capacity of 817 mAhg-cat. with high reversible capacity. Charging potential is suppressed at 3.6 V vs. LiLi™, which is highly effective for preventing the decomposition of organic electrolyte. The mesoporous β-MnO2Pd electrode shows good rate capability and cycle stability. Ex-situ and in-situ XRD results suggested that the observed capacity comes primarily from the oxidation of Li™ to Li2O 2 followed by Li2O after discharge to 2.0 V vs. LiLi™. Electron spin resonance measurements suggest that the formation of superoxide anion radicals contributs to the oxidation of Li™ and the radicals were recovered during charge. Ex-situ FTIR measurement suggested that no electrolyte decomposition was observed and no Li2CO3 was formed during discharge when ethylene carbonate (EC)-diethyl carbonate (DEC) (3:7), which is highly stable for Li-air battery, was used as the electrolyte.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume158
Issue number12
DOIs
Publication statusPublished - Nov 22 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Mesoporous β-MnO<sub>2</sub> air electrode modified with pd for rechargeability in lithium-air battery'. Together they form a unique fingerprint.

Cite this